Strain rate effect on crack propagation in concrete

Biolzi, Luigi; Tognon, G.

doi:10.1016/0167-8442(87)90037-1

Cited by 7 publications

(2 citation statements)

References 9 publications

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“…In the present study, beside the pre-existing flaw inclination angle, the influence of the loading conditions (loading rate, loading magnitude) applied to the model was also numerically studied. Most of the experimental studies of time-dependent fracturing behavior in the literature focused on the influence of loading rate on fracture toughness or energy (Backers et al, 2003;Bazant and Gettu, 1992;Biolzi and Tognon, 1987;Xia et al, 2008;Yamamoto et al, 2004;Yoon et al, 1999;Zhang et al, 2009;Zhou et al, 2010;Zielinski, 1984). A number of theories have been developed to account for the relevant influence of loading rate (Reinhardt and Weerheijm, 1991;Vanel et al, 2009;Webb and Aifantis, 1970).…”

Section: Introductionmentioning

confidence: 99%

Influence of flaw inclination angle and loading condition on crack initiation and propagation

Wong

2012

International Journal of Solids and Structures

179

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Keywords:Pre-existing flaw inclination angle Loading rate Magnitude of pressure boundary Finite element method Non-linear dynamics method AUTODYN a b s t r a c t With reference to the experimental observation of crack initiation and propagation from pre-existing flaws in rock specimens under compression, the influences of pre-existing flaw inclination angle on the cracking processes were analyzed by means of finite element method (FEM) and non-linear dynamics method. FEM analysis on the stress field distribution induced by the presence of a pre-existing flaw provided better understanding for the influence of flaw inclination angle on the initiation position and initiation angle of the potential cracks. Numerical analysis based on the non-linear dynamics method was performed to simulate the cracking processes. The resultant crack types, crack initiation sequences and the overall crack pattern were different under different loading conditions. Under a relatively low loading rate or a small magnitude of maximum loading pressure, tensile cracks would tend to initiate prior to shear cracks. In contrast, under a relatively high loading rate and a large magnitude of maximum loading pressure, shear cracks would tend to initiate prior to tensile cracks instead.

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Section: Introductionmentioning

confidence: 99%

Influence of flaw inclination angle and loading condition on crack initiation and propagation

Wong

2012

International Journal of Solids and Structures

179

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“…In fact, dams or their components will inevitably suffer dynamic loads such as earthquake, impact and even explosion in their service life. It was found that the fracture process and the failure mode of concrete have significant differences under different strain rates 17–21 . But the study on the fracture behaviour of dam concrete under different strain rates is relatively rare.…”

Section: Introductionmentioning

confidence: 99%

Fracture behaviour analysis of the full‐graded concrete based on digital image correlation and acoustic emission technique

Fan

Chen

et al. 2020

Fatigue Fract Eng Mat Struct

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Three-point bending tests of the full-graded concrete under different loading rates were carried out. The cracks were quantitatively analyzed by digital image correlation (DIC). The toughening mechanism during the crack development process was observed, and there are obvious crack branching and aggregate interlocking during the crack propagation. At the same load level, the crack opening width increases with the increase of the loading rate. DIC detects a decrease in the tortuosity of the fracture morphology. And at the same time, the damage of the dam concrete was evaluated by the frequency analysis and the damage type analysis from acoustic emission (AE) signals.The signal strength increases at a higher loading rate as well as the tensile type cracks. The results show that the monitoring results of DIC and AE technique are in agreement with each other, which is very effective for determining the fracture behaviour of concrete materials. Highlights• The aggregate interlocking and crack branching form the toughening mechanism after peak • The interlocking and crack branching decrease with the increase of the loading rate. • Signals with different frequency content correspond to different fracture scale. • The development type of crack tends to direct tension with the increase of the rate. K E Y W O R D Sacoustic emission, dam concrete, digital image correlation, fracture behaviour

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